The official MS Xbox 360 Wireless Steering Wheel with Force Feedback is £59.99 delivered, but use code IDEAL97TF3 to get £5 off.
* Superb realism via force feedback - fights against you as you turn corners
* The Only wheel with wireless freedom
* Includes lap-mount and table-mount with quick release
* 270 degree steering angle
Not totally wireless as it needs to be plugged into the mains to get the full force feedback effect, and also wires connect the pedals. It connects to the Xbox wirelessly.
Reviews seem to be pretty good for it.